12.8.1 MimeWriter Objects

MimeWriter instances have the following methods:

addheader(

key, value[, prefix])

Add a header line to the MIME message. The key is the name of
the header, where the value obviously provides the value of the
header. The optional argument prefix determines where the header
is inserted; "0" means append at the end, "1" is insert at
the start. The default is to append.

flushheaders(

)

Causes all headers accumulated so far to be written out (and
forgotten). This is useful if you don't need a body part at all,
e.g. for a subpart of type message/rfc822 that's (mis)used
to store some header-like information.

startbody(

ctype[, plist[, prefix]])

Returns a file-like object which can be used to write to the
body of the message. The content-type is set to the provided
ctype, and the optional parameter plist provides
additional parameters for the content-type declaration. prefix
functions as in addheader() except that the default is to
insert at the start.

startmultipartbody(

subtype[,
boundary[, plist[, prefix]]])

Returns a file-like object which can be used to write to the
body of the message. Additionally, this method initializes the
multi-part code, where subtype provides the multipart subtype,
boundary may provide a user-defined boundary specification, and
plist provides optional parameters for the subtype.
prefix functions as in startbody(). Subparts should be
created using nextpart().

nextpart(

)

Returns a new instance of MimeWriter which represents an
individual part in a multipart message. This may be used to write the
part as well as used for creating recursively complex multipart
messages. The message must first be initialized with
startmultipartbody() before using nextpart().

lastpart(

)

This is used to designate the last part of a multipart message, and
should always be used when writing multipart messages.